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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 428 |
| 3 | 58747 |
| 4 | 1758473969 |
| 5 | 340760636747 |
| 6 | 14410746502617904 |
| 7 | 673020037180959760871 |
| 8 | 1736622037158911219053381734718 |
| 9 | 400539731185759177060380684246324 |
[0,4,428,58747,1758473969,340760636747, 14410746502617904,673020037180959760871, 1736622037158911219053381734718, 400539731185759177060380684246324] |